Then maybe your address boundary is wrong. openHAB modbus binding uses register addressing, starting from zero. Many manufacturers data sheets give register numbers, which start from 1.
So far as I can see from your screenshot though, the addressing is correct.
Okay, so your bus monitor shows a return of data bytes
01 04 04 65 43 E0 8E
That will be 16-bit input registers 4 = 6543 and register 5 = E08E
There’s two ways to put those together as a 32-bit float
“ABCD” 6543E08E (OH float32 type) = 5.7812735 E22, quite large number
or
“CDAB” E08E6543 (OH float32_swap type) = -8.208545 E19, quite a large negative number
Neither of those values looks particularly sensible,
If you are expecting around 230 - a voltage perhaps? - then the returned registers must be byte-swapped in the way you did in the screenshot, "BADC`
That is an unusual way to do it, but as I said there are no real rules.
But because it is unusual (I’ve never seen it before) there is no provision for it in the OH Modbus binding.
I think perhaps you will have to fetch the registers as a 32-bit integer and use either a rule or a transform to treat that as bytes, rearrange, and then do IEEE754 convert.
Or fetch as four bytes, and convert in a rule.
This old post has a bytes-to-float rule snippet